Ethernet cable size is commonly described by American Wire Gauge, or AWG. A lower AWG number means a larger conductor: 23 AWG is thicker than 24 AWG, while 28 AWG is thinner than both.
That simple rule does not make AWG a speed rating. Wire gauge affects DC resistance, insertion loss, Power over Ethernet margin, flexibility, and cable density, but it does not by itself define Cat5e, Cat6, Cat6A, channel length, or installation quality.
The correct choice depends on where the cable is used. A 90-meter permanent link, a two-meter equipment cord, and a high-density 28 AWG patching zone should not be designed by the same rule. FOCC's overview of Ethernet cable categories provides the broader Category context.
Quick AWG Selection Guide
| Application | Practical starting point | Main reason |
|---|---|---|
| Permanent Cat5e or Cat6 link | 23 or 24 AWG solid bare copper | Lower resistance and stable punch-down termination |
| Permanent Cat6A link | Commonly 22 or 23 AWG solid bare copper | Useful electrical margin for 10GBASE-T and PoE designs |
| Normal equipment patch cord | 24 or 26 AWG stranded copper | Balances flexibility with channel performance |
| Dense switch patching | Short 28 AWG slim patch cord | Reduces congestion, but requires length and PoE checks |
| High-power PoE or hot pathway | Lower-resistance, standards-compliant design | Reduces voltage-drop and heat risk |
| Extended-distance proprietary system | Product-specific 22 or 23 AWG design | Larger conductors may improve margin but do not override Ethernet standards |
These are starting points, not universal Category rules. Compare the complete cable specification, connecting hardware, channel length, environment, and test result. FOCC's Cat5 vs Cat5e vs Cat6 comparison explains why Category selection must remain separate from gauge selection.
What AWG Means
AWG is a standardized system for the nominal size of round electrical conductors. The current ASTM B258-18(2026) specification defines nominal diameters and cross-sectional areas for AWG sizes of solid round wires used as electrical conductors.
- A lower AWG number indicates a larger conductor.
- A larger copper conductor normally has lower DC resistance over the same length.
- A higher AWG number indicates a smaller, lighter, and usually more flexible conductor.
- AWG describes the conductor, not the complete finished cable.
Nominal AWG Conductor Sizes
The values below are approximate nominal diameters for solid round conductors. They do not include insulation, shielding, separators, or the cable jacket.
| AWG | Approximate nominal diameter | Common Ethernet use | Main design trade-off |
|---|---|---|---|
| 22 AWG | 0.64 mm | Selected high-margin, industrial, or proprietary extended-distance products | Low resistance but large, stiff cable construction |
| 23 AWG | 0.57 mm | Many Cat6 and Cat6A permanent cables | Good electrical margin with more pathway fill |
| 24 AWG | 0.51 mm | Many Cat5e and Cat6 permanent cables and patch cords | Balanced size, flexibility, and performance |
| 26 AWG | 0.40 mm | Flexible equipment and work-area patch cords | Higher resistance and insertion loss than larger conductors |
| 28 AWG | 0.32 mm | Slim patch cords in dense racks | Space savings with channel-length and PoE constraints |
AWG Is Not Category, Speed, or Finished Cable Diameter
A cable does not become Cat6A because it uses 23 AWG conductors. Category performance also depends on pair design, impedance, twist consistency, return loss, insertion loss, crosstalk, connectors, workmanship, and the applicable component or channel test.
A well-designed 24 AWG product can therefore outperform a poorly made 23 AWG cable in important transmission parameters. When comparing network cable options, treat AWG as one line in the specification rather than the product's complete quality grade.
AWG is also different from finished outside diameter. Two 24 AWG cables can have different ODs because of:
- Insulation thickness and material
- Pair separators
- Foil or braid shielding
- Drain wires and ripcords
- Jacket material and fire rating
- Mechanical reinforcement
A shielded 26 AWG cable can consequently be larger than an unshielded 24 AWG cable. Check both AWG and finished OD when planning conduit fill, tray capacity, cable managers, glands, boots, and panel density.
Solid, Stranded, Bare Copper, and CCA
Solid Conductors for Permanent Links
A solid conductor contains one continuous wire beneath the insulation. It is normally used for horizontal permanent links because it provides lower DC resistance and insertion loss than a comparable stranded construction and is designed for stable IDC punch-down termination.
Fluke Networks' guidance on solid and stranded cable notes that structured cabling normally uses solid cable for the 90-meter horizontal portion and stranded cable for shorter flexible cords.
Stranded Conductors for Patch Cords
A stranded conductor contains several smaller copper strands. It tolerates repeated movement better and is easier to route between switches, patch panels, servers, and work-area outlets.
The trade-off is higher attenuation and resistance. Fluke reports that stranded constructions can exhibit roughly 20% more attenuation for 24 AWG and 50% more for 26 AWG than comparable solid conductors. The exact cord design and test result still control acceptance.
Bare Copper vs Copper-Clad Aluminum
AWG describes geometry, not conductor material. Two products marked 24 AWG can behave differently if one uses solid bare copper and the other uses copper-clad aluminum, or CCA.
Fluke Networks' CCA application note explains that aluminum has substantially higher resistance than copper of the same diameter, increasing heat and reducing the voltage available at a powered device. It also warns that improperly marketed CCA Category cable can fail applicable standards and safety-listing requirements.
For structured Ethernet cabling and PoE procurement, specify the conductor material explicitly. Do not accept "23 AWG" or "24 AWG" as proof that the cable is solid bare copper. A relevant FOCC AWG LAN cable option can be evaluated against the same material, rating, and test requirements.
How AWG Affects Ethernet Performance
DC Resistance and Voltage Drop
DC resistance increases as conductors become thinner, longer, or hotter. Higher resistance causes more voltage drop and power dissipation in PoE channels.
For screening purposes, the designer should compare the cable manufacturer's maximum DC loop resistance with the planned permanent-link and patch-cord lengths. The approved calculation must use product data and project conditions rather than a generic AWG-only estimate.
Insertion Loss
Insertion loss is the reduction in signal strength as it passes through cable and connecting hardware. It generally increases with cable length, smaller conductors, stranded construction, connectors, and temperature.
Thicker conductors can improve insertion-loss margin, but they do not correct poor pair geometry, excessive untwist, mismatched hardware, or damaged cable. A Category result must be verified with the correct test limit.
PoE Heat and Resistance Unbalance
IEEE 802.3bt-2018 increased standardized powered-device capability by using all four pairs in the structured wiring plant. As power and current increase, conductor resistance, bundle size, ambient temperature, connector quality, and current balance become more important.
DC resistance unbalance is the difference in resistance between conductors in a pair or between powered pairs. Excessive unbalance can prevent current from sharing evenly and can impair PoE and data performance. Fluke's current DC resistance unbalance guidance recommends including the measurement when the project specification, warranty, or PoE risk justifies it.
FOCC's guide to lowering PoE cabling temperature provides additional bundle and thermal considerations.
28 AWG Slim Patch Cords and Channel Derating
A 28 AWG patch cord is not automatically non-compliant or low quality. It is a specialized cord for short, dense patching where reduced congestion and easier access are valuable.
The smaller conductor produces more DC resistance and insertion loss, so the total 28 AWG cord length must be controlled. TIA's published committee records list TSB-184-A-1 guidance for the use of 28 AWG cords for power delivery.
Worked 28 AWG Length Example
Fluke Networks recommends a 1.95 derating factor in its published 28 AWG patch-cord example. Using its calculation:
Maximum permanent-link length = 102 m - (1.95 × total 28 AWG cord length)
For a channel with 10 meters of 28 AWG patch cords:
102 m - (1.95 × 10 m) = 82.5 m permanent link
The resulting channel is 92.5 meters: 82.5 meters of permanent-link cable plus 10 meters of patch cords.
| Total 28 AWG cord length | Calculated maximum permanent link | Calculated total channel |
|---|---|---|
| 6 m | 90.3 m | 96.3 m |
| 10 m | 82.5 m | 92.5 m |
| 15 m | 72.75 m | 87.75 m |
This is an industry guidance example, not a substitute for the cord manufacturer's derating factor or a completed channel certification. PoE designs also require power, bundle, and temperature review.
Choosing AWG for Common Applications
General Office Permanent Link
A standards-compliant 23 or 24 AWG solid bare-copper cable is a practical starting point for most Cat5e or Cat6 horizontal links. FOCC's Cat5e UTP cable page illustrates the product fields that should be checked rather than assuming Category from AWG alone.
New Cat6A and 10GBASE-T Cabling
Many Cat6A permanent cables use 22 or 23 AWG solid conductors to provide electrical margin, but gauge remains only one requirement. The complete system must meet Cat6A transmission and alien-crosstalk requirements.
A product such as FOCC's Cat6A network cable should be reviewed for conductor material, shielding format, jacket, OD, temperature, and applicable test evidence.
High-Density Rack Patching
Use short 28 AWG slim cords where reduced pathway fill and port access justify the derating. Keep the total slim-cord length documented and avoid unmanaged bundles in high-power PoE applications.
Wireless Access Point or Security Camera
For a powered ceiling device, evaluate the full channel rather than choosing AWG from device type alone:
- Record the PSE and powered-device requirements.
- Confirm permanent-link and patch-cord lengths.
- Check conductor material and maximum DC resistance.
- Review bundle size, ambient temperature, and jacket rating.
- Check connecting-hardware compatibility and contact quality.
- Define the required Category and PoE test evidence.
When the route or device requires plenum-rated construction, FOCC's Cat6 plenum cable rating guide and CMP cable requirements explain the jacket-rating decision separately from AWG.
Connector and Patch-Panel Compatibility
RJ45 plugs, keystone jacks, field plugs, and IDC contacts are designed for defined conductor and insulation ranges. Before ordering or terminating, verify:
- Supported AWG range
- Solid or stranded conductor compatibility
- Conductor insulation diameter
- Finished cable outside diameter
- Shielded or unshielded construction
- Category and contact design
- Boot and strain-relief range
A plug designed for 24 AWG stranded conductors may not terminate 23 AWG solid cable correctly. FOCC's guide to choosing an RJ45 plug and boot covers these mechanical checks. When mixing generations of components, also review whether a Cat6 patch panel can be used with Cat6A cable.
How to Read a Cable Jacket and Data Sheet
A useful cable specification includes more than "Cat6, 23 AWG." Consider this illustrative marking:
CAT6A 4PR 23AWG SOLID BC U/UTP CMR 75°C
| Marking | Meaning |
|---|---|
| CAT6A | Declared transmission category |
| 4PR | Four twisted pairs |
| 23AWG | Nominal conductor gauge |
| SOLID | Solid-conductor construction |
| BC | Bare copper, subject to manufacturer documentation |
| U/UTP | No overall shield and no individual pair shield |
| CMR | Riser-rated jacket designation |
| 75°C | Declared temperature rating |
Also verify listing marks, manufacturer identity, batch or lot code, sequential length marking, finished OD, electrical values, and the applicable test standard.
RFQ Examples
Permanent cable: Cat6A U/UTP horizontal cable, 23 AWG solid bare copper, four pairs, CMR jacket, 305-meter pull box, with manufacturer data for DC resistance, insertion loss, PoE application limits, and permanent-link certification.
Slim patch cord: Cat6A 28 AWG stranded bare-copper patch cord, 2-meter length, factory patch-cord tested, with documented channel derating and PoE installation guidance.
FOCC's broader guide to choosing an Ethernet cable category can support the category decision before the RFQ is finalized.
Testing and Acceptance Evidence
AWG and jacket markings cannot prove that an installed channel supports the intended application.
| Test level | What it can establish | What it cannot establish alone |
|---|---|---|
| Wiremap verification | Opens, shorts, reversals, split pairs, and basic continuity | Category performance or PoE margin |
| Application qualification | Whether a tester predicts support for selected network applications | Full standards certification |
| Patch-cord test | Factory or field performance of the cord under a patch-cord limit | Performance of the installed permanent link |
| Permanent-link certification | Installed horizontal cable and fixed connecting hardware under the selected Category limit | Performance of equipment and work-area cords not included in the link |
| Channel certification | End-to-end cabling including the permitted patch cords and connectors | Switch, NIC, configuration, or application behavior |
| PoE-focused measurements | DC loop resistance and, where specified, resistance unbalance | Complete thermal behavior of every possible bundle and load |
A certification record may include wiremap, length, insertion loss, NEXT, power-sum NEXT, return loss, delay, delay skew, DC loop resistance, and specified resistance-unbalance results. Use the correct test limit for the patch cord, permanent link, or channel.
FOCC's article on how to test an Ethernet cable explains basic tester functions. Project acceptance should state the tester model, test limit, calibration status, date, cable identifier, and electronic result file.
Common AWG Selection Mistakes
| Mistake | Why it fails | Better approach |
|---|---|---|
| Assuming lower AWG always means faster Ethernet | Gauge does not define Category or complete transmission performance | Select by Category, channel design, and certification result |
| Treating all Cat6 cable as 23 AWG | Category and conductor size are separate specifications | Read the jacket and data sheet |
| Using long 28 AWG cords without derating | Higher resistance and insertion loss can shorten the permitted channel | Apply the documented derating factor and certify the channel |
| Ignoring conductor material | CCA can have higher resistance despite the same AWG label | Specify solid bare copper and require traceable evidence |
| Selecting a plug only by Category | Contacts may not fit the AWG, insulation, or conductor construction | Match the full mechanical and electrical range |
| Assuming 22 AWG permits unlimited distance | Lower resistance does not override Ethernet application limits | Use an engineered system with documented acceptance criteria |
| Approving a cable only because it says PoE++ | The label does not prove DC resistance, unbalance, bundle, or temperature performance | Request data and define a PoE test plan |
| Accepting a link because it comes up | Link state does not prove Category performance or long-term margin | Complete the specified physical-layer certification |
FAQ
Q: Is 23 AWG better than 24 AWG Ethernet cable?
A: A same-length 23 AWG copper conductor normally has lower resistance and insertion loss than 24 AWG. It may provide more margin for long links and PoE, but Category compliance, materials, connectors, and testing remain decisive.
Q: What AWG is Cat6 cable?
A: Cat6 is commonly available in 23 and 24 AWG constructions. Category does not require one universal gauge for every product.
Q: What AWG is Cat6A cable?
A: Many Cat6A permanent cables use 22 or 23 AWG solid conductors. The product must still meet the complete Cat6A transmission specification.
Q: Can 28 AWG Ethernet cable support PoE?
A: It can be used in approved short patch-cord applications, but the PoE type, total cord length, channel derating, bundle size, ambient temperature, and product guidance must be reviewed.
Q: Does thicker Ethernet wire increase speed?
A: Not by itself. A thicker conductor can improve resistance and insertion-loss margin, but speed support depends on Category, channel length, pair design, connectors, installation, and test results.
Final Procurement Checklist
- Required Ethernet rate and Category
- Permanent cable, ordinary patch cord, or slim patch cord
- Solid or stranded construction
- Conductor AWG and material
- Total permanent-link and patch-cord length
- PoE type, device requirement, bundle size, and ambient temperature
- Shielding format and grounding plan where applicable
- Jacket and fire rating
- Connector AWG, insulation, and OD range
- Product listing, traceability, and data-sheet values
- Patch-cord, permanent-link, or channel certification requirement
- Electronic test records and PoE-focused measurements where specified
Ethernet cable gauge matters because it changes resistance, loss, flexibility, and PoE margin. It is never the complete specification. Select AWG as part of the channel design, then verify the Category, conductor material, construction, connecting hardware, environment, and final test evidence.
